This audiobook by Mike Shelton is about a few apprentices that differ in opinion to their mentors. and this is partly because they have become aware of how powerful they are.
One of the apprentices, is Roland who wants permission to become a full wizard.
He also has two older brothers and seems to have a problem with how people treat him. It also appears that he has a tendency to think that he is better than anyone else.
Then the other male apprentice had found out that dragons may be real, and he disappears. Also, his superiors are quite concerned that he may, swap sides.
As he was last seen with a female healer. Though they hope that his disappearance was just because he was gathering information for them.